Ozone Hourly Averages

Ozone is a form of oxygen with three atoms instead of the usual two atoms. It is a photochemical oxidant and, at ground level, is the main component of smog. Unlike other gaseous pollutants, ozone is not emitted directly into the atmosphere. Instead, it is created in the atmosphere by the action of sunlight on volatile organic compounds and nitrogen oxides.

In Texas, higher levels of ozone usually occur on sunny days with light winds, primarily from March through October. An ozone exceedance day is counted if the measured eight-hour average ozone concentration exceeds the standards.

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Region	CAMS	Morning												Afternoon							CAMS	POC	Entity
Ozone Hourly Averages for Wednesday, April 17, 2024. measured in parts per billion
Region	CAMS	Mid	1:00	2:00	3:00	4:00	5:00	6:00	7:00	8:00	9:00	10:00	11:00	Noon	1:00	2:00	3:00	4:00	5:00	6:00	CAMS	POC	Entity
Dallas-Fort Worth - all times are in CST
	13	22	19	20	17	13	11	10	5	12	23	29	35	40	41	42	37	36	35	FEW	13	2 ^R ^MDL	TCEQ
	17	24	22	22	19	17	14	14	13	16	19	26	38	45	47	46	43	41	41	FEW	17	2 ^R ^MDL	TCEQ
	31	25	23	20	19	18	17	14	15	18	25	29	37	48	48	47	49	47	41	FEW	31	1 ^R ^MDL	TCEQ
	56	21	19	17	17	16	13	13	15	16	19	26	37	45	51	52	50	46	42	FEW	56	1 ^R ^MDL	TCEQ
	61	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	QAS	61	1 ^R ^MDL	TCEQ
	63	21	19	16	17	14	10	9	11	14	18	26	33	38	41	42	46	44	38	FEW	63	1 ^R ^MDL	TCEQ
	69 ¹	19	19	20	20	19	14	14	16	21	26	32	34	37	39	41	42	36	33	FEW	69 ¹	1 ^R ^MDL	Other Gov
	70	22	18	17	16	15	14	13	10	15	23	28	34	40	41	42	41	35	34	NA	70	1 ^R ^MDL	TCEQ
	71	28	26	24	20	18	17	15	17	20	28	32	32	37	41	42	36	35	30	FEW	71	1 ^R ^MDL	TCEQ
	73	19	17	18	14	10	7	8	9	16	21	28	33	35	37	39	39	39	37	FEW	73	1 ^R ^MDL	TCEQ
	75 ²	22	20	19	18	14	14	16	17	18	22	27	37	45	48	47	47	42	39	FEW	75 ²	1 ^R ^MDL	TCEQ
	76	18	15	15	18	16	12	12	12	15	21	27	29	PMA	CAL	CAL	CAL	33	31	FEW	76	1 ^R ^MDL	TCEQ
	77	20	19	19	17	15	13	13	15	PMA	PMA	32	34	37	37	37	39	36	37	FEW	77	1 ^R ^MDL	TCEQ
	401 ³	21	18	16	14	10	6	3	4	11	23	31	37	39	39	41	47	45	39	FEW	401 ³	3 ^R ^MDL	Other Gov
	402 ¹	22	23	23	22	15	5	3	11	19	30	PMA	38	40	40	42	45	47	41	FEW	402 ¹	1 ^R ^MDL	Other Gov
	1006	13	16	17	17	16	14	14	14	17	21	24	28	30	33	38	38	36	32	FEW	1006	1 ^R ^MDL	TCEQ
	1032	20	18	17	18	16	15	11	15	19	22	26	33	47	58	55	50	48	49	FEW	1032	1 ^R ^MDL	TCEQ
	1044	20	20	18	16	15	12	11	14	PMA	QAS	QAS	31	32	36	38	34	32	32	FEW	1044	1 ^R ^MDL	TCEQ
	1051	17	19	19	16	13	13	12	15	SPZ	25	29	38	45	45	38	36	37	37	FEW	1051	1 ^R ^MDL	TCEQ
		Notes: ¹- These sites are maintained and operated by the City of Dallas. ²- These sites are maintained and operated by AECOM for North Texas Commission (NTC). ³- These sites are maintained and operated by the City of Dallas (Met NOx O3 SO2 CO). TCEQ does not certify the validity or quality of data it hosts from other monitoring entities.
		Maximum values for the day are bold within the table. Minimum values are *bold italic*.
		^R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.

PLEASE NOTE: This data has not been verified by the TCEQ and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from TCEQ ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.

Following EPA reporting guidelines, negative values may be displayed in our hourly criteria air quality data, down to the negative of the EPA listed Method Detection Limit (MDL) for the particular instrument that made the measurements. The reported concentrations can be negative due to zero drift in the electronic instrument output, data logger channel, or calibration adjustments to the data. Prior to 1/1/2013, slightly negative values were automatically set to zero.

Texas Commission on Environmental Quality

Ozone Hourly Averages